R. A. F. CAIRO TO KHARTOUM EXPERIMENTAL FLIGHT. In January 1926 a special flight was undertaken from Cairo to Khartoum and back by 47 squadron testing a Fairy IIID aircraft. The flight was intended to be a preparation for a Cairo to Cape Town flight later that year. This cover has a 5m cancelled ABU SUWER JAN 9 26. (Cairo) The flight cachet is at the upper left and the arrival h/s of 11/1/26 at the lower left along with the pilot – L. E. Stoner’s signature. Only 70 covers were flown. Fine and scarce.